Clean Room Sterile Dynamic Pass through box is self-contained units with class 100 Laminar air flow unit installed at entrance to the clean rooms. They minimize the amount of particulate contamination entering the clean room by reducing the operator traffic. The Laminar flow in the pass box starts running. When the doors are opened for material transfer in order to maintain air cleanliness required for the product which is equipped a mechanical interlock system that prevents both the doors from being opened at the same time.